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Mention DCO as a requirement in CONTRIBUTORS.md #5226

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Job	Run time
build	5m 24s
container-build	1m 43s
issue-872-e2e	3m 43s
harness	11m 27s
e2e	8m 48s
backfill	6m 57s
sharding-e2e	3m 52s
	41m 54s